<template>
    
        <div class="container">
        <div class="item1"></div>
        <div class="item2"></div>
        <div class="item3"></div>     
    </div>
</template>
<script>
export default {
    data() {
        return {};
        
    },
    methods:{},
};
</script>

<style scoped>
.container{
 display: flex;
}

.item1{
  flex-grow: 1;
  height: 100px;
  background: red;
  
}
.item2{
  flex-grow: 2;
  height: 100px;
  background: blue;
  
}

.item3 {
  flex-grow: 3;
  height: 100px;
  background: green;
}
</style>